2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2005 infineon
17 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/errno.h>
24 #include <linux/proc_fs.h>
25 #include <linux/init.h>
26 #include <linux/ioctl.h>
27 #include <linux/timer.h>
28 #include <linux/module.h>
29 #include <linux/timer.h>
30 #include <linux/interrupt.h>
31 #include <linux/kobject.h>
32 #include <linux/workqueue.h>
33 #include <linux/skbuff.h>
34 #include <linux/netlink.h>
35 #include <linux/platform_device.h>
37 #include <asm/uaccess.h>
38 #include <asm/semaphore.h>
39 #include <asm/uaccess.h>
40 #include <asm/ifxmips/ifxmips.h>
41 #include <asm/ifxmips/ifxmips_ioctl.h>
44 #define PINS_PER_PORT 16
46 #define DRVNAME "ifxmips_gpio"
48 static unsigned int ifxmips_gpio_major
= 0;
50 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
51 #define IFXMIPS_RST_PIN 15
52 #define IFXMIPS_RST_PORT 1
54 static struct timer_list rst_button_timer
;
56 extern struct sock
*uevent_sock
;
57 extern u64
uevent_next_seqnum(void);
58 static unsigned long seen
;
59 static int pressed
= 0;
62 struct work_struct wq
;
64 unsigned long jiffies
;
68 /* TODO do we need this ? */
69 static struct semaphore port_sem
;
71 /* TODO do we really need this ? return in a define is forbidden by coding style */
72 #define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
75 ifxmips_port_reserve_pin (unsigned int port
, unsigned int pin
)
78 printk("%s : call to obseleted function\n", __func__
);
82 EXPORT_SYMBOL(ifxmips_port_reserve_pin
);
85 ifxmips_port_free_pin (unsigned int port
, unsigned int pin
)
88 printk("%s : call to obseleted function\n", __func__
);
92 EXPORT_SYMBOL(ifxmips_port_free_pin
);
95 ifxmips_port_set_open_drain (unsigned int port
, unsigned int pin
)
98 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
102 EXPORT_SYMBOL(ifxmips_port_set_open_drain
);
105 ifxmips_port_clear_open_drain (unsigned int port
, unsigned int pin
)
108 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
112 EXPORT_SYMBOL(ifxmips_port_clear_open_drain
);
115 ifxmips_port_set_pudsel (unsigned int port
, unsigned int pin
)
118 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
122 EXPORT_SYMBOL(ifxmips_port_set_pudsel
);
125 ifxmips_port_clear_pudsel (unsigned int port
, unsigned int pin
)
128 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
132 EXPORT_SYMBOL(ifxmips_port_clear_pudsel
);
135 ifxmips_port_set_puden (unsigned int port
, unsigned int pin
)
138 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
142 EXPORT_SYMBOL(ifxmips_port_set_puden
);
145 ifxmips_port_clear_puden (unsigned int port
, unsigned int pin
)
148 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
152 EXPORT_SYMBOL(ifxmips_port_clear_puden
);
155 ifxmips_port_set_stoff (unsigned int port
, unsigned int pin
)
158 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
162 EXPORT_SYMBOL(ifxmips_port_set_stoff
);
165 ifxmips_port_clear_stoff (unsigned int port
, unsigned int pin
)
168 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
172 EXPORT_SYMBOL(ifxmips_port_clear_stoff
);
175 ifxmips_port_set_dir_out (unsigned int port
, unsigned int pin
)
178 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
182 EXPORT_SYMBOL(ifxmips_port_set_dir_out
);
185 ifxmips_port_set_dir_in (unsigned int port
, unsigned int pin
)
188 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
192 EXPORT_SYMBOL(ifxmips_port_set_dir_in
);
195 ifxmips_port_set_output (unsigned int port
, unsigned int pin
)
198 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
202 EXPORT_SYMBOL(ifxmips_port_set_output
);
205 ifxmips_port_clear_output (unsigned int port
, unsigned int pin
)
208 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
212 EXPORT_SYMBOL(ifxmips_port_clear_output
);
215 ifxmips_port_get_input (unsigned int port
, unsigned int pin
)
219 if (ifxmips_r32(IFXMIPS_GPIO_P0_IN
+ (port
* 0xC)) & (1 << pin
))
224 EXPORT_SYMBOL(ifxmips_port_get_input
);
227 ifxmips_port_set_altsel0 (unsigned int port
, unsigned int pin
)
230 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
234 EXPORT_SYMBOL(ifxmips_port_set_altsel0
);
237 ifxmips_port_clear_altsel0 (unsigned int port
, unsigned int pin
)
240 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
244 EXPORT_SYMBOL(ifxmips_port_clear_altsel0
);
247 ifxmips_port_set_altsel1 (unsigned int port
, unsigned int pin
)
250 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) | (1 << pin
), IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
254 EXPORT_SYMBOL(ifxmips_port_set_altsel1
);
257 ifxmips_port_clear_altsel1 (unsigned int port
, unsigned int pin
)
260 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) & ~(1 << pin
), IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
264 EXPORT_SYMBOL(ifxmips_port_clear_altsel1
);
266 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
267 static inline void add_msg(struct sk_buff
*skb
, char *msg
)
270 scratch
= skb_put(skb
, strlen(msg
) + 1);
271 sprintf(scratch
, msg
);
274 static void hotplug_button(struct work_struct
*wq
)
277 struct event_t
*event
;
282 event
= container_of(wq
, struct event_t
, wq
);
286 /* allocate message with the maximum possible size */
287 s
= event
->set
? "pressed" : "released";
289 skb
= alloc_skb(len
+ 2048, GFP_KERNEL
);
294 scratch
= skb_put(skb
, len
);
295 sprintf(scratch
, "%s@",s
);
297 /* copy keys to our continuous event payload buffer */
298 add_msg(skb
, "HOME=/");
299 add_msg(skb
, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
300 add_msg(skb
, "SUBSYSTEM=button");
301 add_msg(skb
, "BUTTON=reset");
302 add_msg(skb
, (event
->set
? "ACTION=pressed" : "ACTION=released"));
303 sprintf(buf
, "SEEN=%ld", (event
->jiffies
- seen
)/HZ
);
305 snprintf(buf
, 128, "SEQNUM=%llu", uevent_next_seqnum());
308 NETLINK_CB(skb
).dst_group
= 1;
309 netlink_broadcast(uevent_sock
, skb
, 0, 1, GFP_KERNEL
);
315 static void reset_button_poll(unsigned long unused
)
317 struct event_t
*event
;
319 rst_button_timer
.expires
= jiffies
+ HZ
;
320 add_timer(&rst_button_timer
);
322 if (pressed
!= ifxmips_port_get_input(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
))
328 printk("button was %s\n", (pressed
? "pressed" : "released"));
329 event
= (struct event_t
*) kzalloc(sizeof(struct event_t
), GFP_ATOMIC
);
332 printk("Could not alloc hotplug event\n");
335 event
->set
= pressed
;
336 event
->jiffies
= jiffies
;
337 INIT_WORK(&event
->wq
, (void *)(void *)hotplug_button
);
338 schedule_work(&event
->wq
);
345 ifxmips_gpio_probe (struct platform_device
*dev
)
349 sema_init (&port_sem
, 1);
351 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
352 ifxmips_port_set_open_drain(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
353 ifxmips_port_clear_altsel0(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
354 ifxmips_port_clear_altsel1(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
355 ifxmips_port_set_dir_in(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
359 init_timer(&rst_button_timer
);
360 rst_button_timer
.function
= reset_button_poll
;
361 rst_button_timer
.expires
= jiffies
+ HZ
;
362 add_timer(&rst_button_timer
);
365 printk(KERN_INFO DRVNAME
": device successfully initialized #%d.\n", ifxmips_gpio_major
);
371 ifxmips_gpio_remove (struct platform_device
*pdev
)
373 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
374 del_timer_sync(&rst_button_timer
);
376 unregister_chrdev(ifxmips_gpio_major
, DRVNAME
);
382 platform_driver ifxmips_gpio_driver
= {
383 .probe
= ifxmips_gpio_probe
,
384 .remove
= ifxmips_gpio_remove
,
387 .owner
= THIS_MODULE
,
392 ifxmips_gpio_init (void)
394 int ret
= platform_driver_register(&ifxmips_gpio_driver
);
396 printk(KERN_INFO DRVNAME
": Error registering platfom driver!");
401 ifxmips_gpio_exit (void)
403 platform_driver_unregister(&ifxmips_gpio_driver
);
406 module_init(ifxmips_gpio_init
);
407 module_exit(ifxmips_gpio_exit
);